AU-555A recap list

[david winter]

Hi,

Edit: those interested by the recap list which also contain transistor equivalents for the "flying sauccers" may scroll down. It will be eventually updated in the same place.

Anyone has a recap list for the 555A ?
My serial is 581081147 and it uses a different setup as some I've seen (obviously): plugin phono stage board, easily removable tone control board, and different power amp board with the fuses moved between the final stage transistors (2SC1030).

I'm asking for the list to save some time as there are so many cap references at Mouser, Farnell and RS. I prefer Mouser as they have Elna's Silmic II but if you think I should use Nichicons or Panasonics let me know.

So far I changed the small caps but I'd like to use a list with quality capacitors as this is quite a nice amp which definitely deserves a serious recap.
So far I changed the 8002/9002 transistors and used ZTX795 in place of the old XA495 soccers.

Thanks !

 

[stereofun]

Hi David - There are plenty of recap lists out there. But the 555a's have differences, due to revisions - so one cap list may not match what you'll actually find on the board.

I'd recommend you look at board by board and make a list from what you see.

In terms of caps, I'd recommend Nichicon KG for supply and output coupling, alternatively Cornell dubilier's 380 series. For the lower values,47 uf and below, I'd use Silmic II's but keep the voltage value at 16 or above, even when they call for 6.3v - an AK member (Conrad Hoffman) did some testing and found the Silmics to have too wide tolerances on the lower voltages. For the rest I'd stick with Nichicon KZ or FG series.

Stay tuned for some different perspectives and recommendations.

P.S beefing up the supply cap from 2200 to 4700 as well as the outputs from 1500 to 4700, makes this amp breathe a little easier across the board and adds some low end gusto.

 

[david winter]

Here's my recap list for the AU-555A. Updates will eventually be put there.
Any advise welcome

The AU-555A revision that I have is the following:
- plug-in phono stage
- easily removable tone control board (with plug on corner)
- fuses no longer on power amp board but between output transistors

I have used several types of capacitors as you can see.
I refer to the above advise from Tom regarding Nichicons and Elnas.


(2) 10D1 Rectifier diodes:
1N4005 (Mouser: 621-1N4005 from Taiwan Semi or 621-1N4005-T from Diodes Inc.; same price)



Power Supply:
(1) 2200µF/63V upgraded to 4700µF/63V
Nichicon KZ/FG: not available under 63V
Nichicon KG: LKG1J472MESCCK (on Mouser: order pending; 18 weeks) (I=4,5A)
Nichicon KG: LKG1J472MESBBK (not stocked at Mouser ; 17 weeks) (I=3,8A)
Nichicon KG: LKG1J472MESBAK (only KG available at Mouser right now) (I=3,1A)
Cornell 380: 380LX472M063A012 (low stock at Mouser)
Panasonic: ECO-S1JA472EA

(1) 1000µF/50V
Nichicon KZ: UKZ1H102MHM (I not given on Mouser)
Nichicon FG: UFG1H102MHM (I=1,1A)
Nichicon KG: LKG1H102MESYCK (not stocked at Mouser; expect LONG delay) (I=1,8A)
Nichicon KG: LKG1H102MESYBK (I=1,5A)
Nichicon KG: LKG1H102MESABK (seems same as previous type) (I=1,5A)
Nichicon PW: UPW1H102MHD
Cornell SEK: SEK102M050ST (I=1,11A)
Cornell SK: SK102M050ST (seems same as previous type but I not given)

(2) 470µF/50V
Nichicon KZ: UKZ1H471MHM (I not given on Mouser)
Nichicon FG: UFG2A471MHM (I=0,98A)
Nichicon HD: UHD1H471MHD (I=2,05A)



Main Amp Board:
(2) 1µF/50V:
Elna Silmic II: RFS50V010ME3#5 (14mA / D=5.0mm / P=2.0mm)
Elna Silmic II: RFS50V010MF3#5 (18mA / D=6.3mm / P=2.5mm)
Nichicon KZ: not available
Nichicon FG: UFG1H010MDM

(2) 470µF/16V
Elna Silmic II: RFS16V471MI6#5
Nichicon KZ: UKZ1E471MHM (only at 25Vmin)
Nichicon FG: UFG1C471MPM
Nichicon KA: UKA1C471MPD1TD

(2) 47µF/25V
Elna Silmic II: RFS25V470MG3#5 (low stock at Mouser; 35V alternate: RFS35V470MH3#5)
Nichicon KZ: UKZ1E470MPM
Nichicon FG: UFG1J470MPM (only 63V; other is 10V...)
Nichicon KW: UKW1E470MDD

(2) 47µF/50V
Elna Silmic II: RFS50V470MH4#5
Nichicon KZ: UKZ1H470MPM
Nichicon FG: UFG1J470MPM (only 63V; other is 10V...)

(2) 220µF/6.3V
Elna Silmic II: RFS16V221MH5#5 (16V rating recommended)
Nichicon KZ: UKZ1E221MHM (only at 25Vmin)
Nichicon FG: UFG1C221MPM (only at 16Vmin)
Nichicon KA: UKA0J221MED1TD

(2) 1500µF/63V upgraded to 3300µF/63V (4700µF/63V is even better)
Nichicon KZ: Not available at 63V
Nichicon FG: Not available at 63V
Nichicon KG: LKG1J332MESCBK

(1) 220µF/75V
Nichicon KZ: UKZ2A221MHM (only at 100Vmin)
Nichicon FG: Not available at 100V
Nichicon FW: UFW2A221MHD (only at 100Vmin)

(4) CDC-8002
KSC2690A: KSC2690AYS
MJE350
BC639

(2) CDC-9002
KSA1220A: KSA1220AYS
MJE340
BC640

(2) XA-495
ZTX795A



EQ Board:
(2) 3.3µF/25V
Elna Silmic II: RFS100V3R3MG3#5 (only available at 100V at Mouser)
Nichicon KZ: Not available
Nichicon FG: UFG1H3R3MDM (50V)

(2) 100µF/6.3V
Elna Silmic II: RFS16V101MH3#5 (16V recommended)
Nichicon KZ: Not available
Nichicon FG: UFG1A101MEM (10V)

(2) 1µF/50V
Elna Silmic II: RFS50V010ME3#5 (D=5.0mm / P=2.0mm / I=14mA)
Elna Silmic II: RFS50V010MF3#5 (D=6.3mm / P=2.5mm / I=18mA)
Nichicon KZ: Not available
Nichicon FG: UFG1H010MDM



Tone Control Board:
(2) 47µF/6.3V
Elna Silmic II: RFS16V470MG3#5 (16V recommended)
Nichicon KZ: UKZ1E470MPM (only at 25Vmin)
Nichicon FG: UFG1A470MDM (10V)

(2) 10µF/25V (Non Polar)
Nichicon ES: UES1E100MDM

(2) 1µF/50V
Nichicon VP: UVP1H010MDD

(2) 47µF/10V
Elna Silmic II: RFS16V470MG3#5 (16V recommended)
Nichicon KZ: UKZ1E470MPM (only at 25Vmin)
Nichicon FG: UFG1A470MDM

(2) 10µF/25V
Elna Silmic II: RFS25V100ME3#5
Nichicon KZ: UKZ2A100MPM (100Vmin)
Nichicon FG: UFG1H100MDM (50Vmin)
Nichicon SW: USW1E100MDD

 

[The Fuxtor]

I have just recently used your list!! Thank you for posting.
I think there is a mix up with the transistor replacements? I purchased a set of the MJE340/350 to replace the flying saucer transistors. I blindly replaced them only taking care to check for proper pinout. After my dimbulb wouldn't dim, I realized that what was written is mixed up.... They should be swapped . The PNP's are the NPN's and vise versa....
This probably is only for the MJE set im guessing....

(4) CDC-8002
KSC2690A: KSC2690AYS
MJE350
BC639

(2) CDC-9002
KSA1220A: KSA1220AYS
MJE340
BC640

The CDC-8002 should use MJE340
The CDC-9002 should be MJE350

 

[cb1975]

Hi everyone that for sharing this, I'm recapping mine this weekend and had a question?
Where did you use the nonpolar 10uf / 25v on the tone board and may I ask why? Trying to learn not at all questioning reason. I'm guessing one is R and one is channel?

C707 and 708 or
C23 and 24
Thanks !

Tone Control Board:

(2) 10µF/25V (Non Polar)
Nichicon ES: UES1E100MDM


(2) 10µF/25V
Elna Silmic II: RFS25V100ME3#5
Nichicon KZ: UKZ2A100MPM (100Vmin)
Nichicon FG: UFG1H100MDM (50Vmin)
Nichicon SW: USW1E100MDD

 

[The Fuxtor]

I don't remember offhand.... I typically recap one at a time, pull one and replace with new. After each board has been completed, I check with my DBT for mistakes. Keep the mistakes limited to one area if they happen. Work your way through that tone board and I'm sure you will find it? Could be a revised layout possibly too?? Don't think you can go wrong with just replacing what is originally soldered in, unless someone has already been in there???
As far as the reasoning of using bipolar caps , I haven't looked at the SM.... Part of that circuit design I would gather.....

 

[toneriderMUC]

Wow, thank you so much for this. I am about to recap my 555a too - what did you use in the end?

I am thinking:
Power Supply:
(1) 2200µF/63V upgraded to 4700µF/63V
Nichicon KG: LKG1J472MESCCK (super through)


(1) 1000µF/50V
Nichicon KG: LKG1H102MESYCK (super through) (I=1,8A)
Nichicon KG: LKG1H102MESYBK (I=1,5A)

(2) 470µF/50V
Nichicon FG: UFG2A471MHM (I=0,98A)


and

Main Amp Board:
(2) 1500µF/63V upgraded to 4700µF/63V
Nichicon KG:

Good choice for the big ones? Or opt for silmic somewhere? Or something completely else?

 

[david winter]

They will work fine.

 

[margus_]

I have a similar dilemma as the previous poster:

Power Supply:

(1) 2200µF/63V
- Nichicon KG (Super Through): LKG2A222MESCCK (2200 uf / 100V, Ø35 mm, l=50 mm)
- Nichicon KG (Super Through): LKG1J472MESCCK (4700 uf / 63V, Ø35 mm, l=50 mm)
- Nichicon KG (Super Through): LKG1K332MESCCK (3300 uf / 80V, Ø35 mm, l=50 mm)

(1) 1000µF/50V
- Nichicon KG (Super Through): LKG1K122MESBCK (1200 uf / 80V, Ø30 mm, l=35 mm)
- Nichicon KG (Super Through): LKG1H222MESBCK (2200 uf / 50V, Ø30 mm, l=35 mm)
- Nichicon KG (Super Through): LKG1H152MESBCK (1500 uf / 50V, Ø30 mm, l=30 mm)

(2) 470µF/50V
- Nichicon KG (Super Through): LKG2A681MESZCK (680 uf / 100V, Ø22 mm, l=45 mm)
- Nichicon KG (Super Through): LKG1H681MESZCK (680 uf / 50V, Ø22 mm, l=25 mm)
- Nichicon KG (Super Through): LKG1H821MESZCK (820 uf / 50V, Ø22 mm, l=30 mm)
- Nichicon KG (Super Through): LKG1H152MESZCK (1500 uf / 50V, Ø22 mm, l=45 mm)

I already have the options marked in bold. When doubling the capacitance, would it be good to leave the voltage as it was in the original?

 

[Hyperion]

would it be good to leave the voltage as it was in the original?

There is no advantage in increasing the voltage rating apart from size considerations, generally you should try to avoid large increases in voltage rating - like 'double' for example.

 

[david winter]

I only take higher voltage ratings for two reasons: the one you mention, but also the fact that some amplifiers designed to operate at 220Vac are now powered by 230V to 240V mains, hence a higher voltage in the B+ psu. This may require using higher voltage capacitors, especially when the original rating was close to the actual voltage. I have seen some amps with capacitors powered less than 10 volts under their rating, which I find too close.
Using capacitors under a higher voltage should allow a higher riple. This if they are located in the psu section. Reservoir capacitors should be left as is unless clearly identified as insufficient.
Doubling the capacitance is not always better. Unless you clearly show that doubling the capacitance will increase the signal in some cases, or reduce residual hum, I don't think you will gain anyrthing unless those capacitors are cheaper. You may even need to add a signal cutoff when powering off. I have also seen some amps working for several seconds after turning them off due to higher capacitance in the power supply.

 

[Hyperion]

Using capacitors under a higher voltage should allow a higher riple.

Only if you actually use them at the higher voltage. If you are using them at the same voltage as the originals only the 'newness' or use of a higher performance capacitor will allow a potentially higher ripple current. But also remember that the load presented by the amplifier is the same - i.e. same power output, therefore similar current drawn, and similar ripple current requirement.

 

[margus_]

I have also been following these topics:
https://audiokarma.org/forums/index...storation-upgrade-of-a-sansui-au-555a.816754/
https://audiokarma.org/forums/index.php?threads/sansui-au-555a-rebuild-cap-coupled-goodness.648808/

Leestereo recommends increasing the capacity of all PSU capacitors. That is why I have tried to plan it myself too. Capacitors with a larger capacity are well suited for clamps, I definitely want them to be the right diameter. I don't aim to raise the voltage of the capacitors, but I have some of these on the home shelf. I can look for something else instead. I'm not in a hurry. I just want a good result in both sound and appearance.

I don't know much about science in electronics. I just try to find nice suitable capacitors.

 

[margus_]

OK, I reduced the options:

(1) 2200µF/63V
- Nichicon KG (Super Through): LKG1J472MESCCK (4700 uf / 63V, Ø35 mm, l=50 mm)
- Nichicon KG (Gold Tune): LKG1K472MESCBK (4700 uf / 80V, Ø35 mm, l=50 mm)
(1) 1000µF/50V
- Nichicon KG (Super Through): LKG1H222MESBCK (2200 uf / 50V, Ø30 mm, l=35 mm)
(2) 470µF/50V
- Nichicon KG (Gold TUne): LKG1H821MESZBK (820 uf / 50V, Ø22 mm, l=30 mm)

Could such a choice be ok?

 

[AnalogueBen]

I like to stick with what fits the standard clamp. Also I choose to stay with the original uF size for the output coupling caps or the the next size up if needed, you can safely double the main caps uF.
Stick with same voltage, or slightly higher but never lower.

 

[marianisimo]

Thanks for the amazing replace components list

Can anybody confirm list is valid to sansui model au-555 (previous model to au-555a)

thanks in advance !

mariano


QUOTE="david winter, post: 8236713, member: 76388"]Here's my recap list for the AU-555A. Updates will eventually be put there.
Any advise welcome

The AU-555A revision that I have is the following:
- plug-in phono stage
- easily removable tone control board (with plug on corner)
- fuses no longer on power amp board but between output transistors

I have used several types of capacitors as you can see.
I refer to the above advise from Tom regarding Nichicons and Elnas.


(2) 10D1 Rectifier diodes:
1N4005 (Mouser: 621-1N4005 from Taiwan Semi or 621-1N4005-T from Diodes Inc.; same price)



Power Supply:
(1) 2200µF/63V upgraded to 4700µF/63V
Nichicon KZ/FG: not available under 63V
Nichicon KG: LKG1J472MESCCK (on Mouser: order pending; 18 weeks) (I=4,5A)
Nichicon KG: LKG1J472MESBBK (not stocked at Mouser ; 17 weeks) (I=3,8A)
Nichicon KG: LKG1J472MESBAK (only KG available at Mouser right now) (I=3,1A)
Cornell 380: 380LX472M063A012 (low stock at Mouser)
Panasonic: ECO-S1JA472EA

(1) 1000µF/50V
Nichicon KZ: UKZ1H102MHM (I not given on Mouser)
Nichicon FG: UFG1H102MHM (I=1,1A)
Nichicon KG: LKG1H102MESYCK (not stocked at Mouser; expect LONG delay) (I=1,8A)
Nichicon KG: LKG1H102MESYBK (I=1,5A)
Nichicon KG: LKG1H102MESABK (seems same as previous type) (I=1,5A)
Nichicon PW: UPW1H102MHD
Cornell SEK: SEK102M050ST (I=1,11A)
Cornell SK: SK102M050ST (seems same as previous type but I not given)

(2) 470µF/50V
Nichicon KZ: UKZ1H471MHM (I not given on Mouser)
Nichicon FG: UFG2A471MHM (I=0,98A)
Nichicon HD: UHD1H471MHD (I=2,05A)



Main Amp Board:
(2) 1µF/50V:
Elna Silmic II: RFS50V010ME3#5 (14mA / D=5.0mm / P=2.0mm)
Elna Silmic II: RFS50V010MF3#5 (18mA / D=6.3mm / P=2.5mm)
Nichicon KZ: not available
Nichicon FG: UFG1H010MDM

(2) 470µF/16V
Elna Silmic II: RFS16V471MI6#5
Nichicon KZ: UKZ1E471MHM (only at 25Vmin)
Nichicon FG: UFG1C471MPM
Nichicon KA: UKA1C471MPD1TD

(2) 47µF/25V
Elna Silmic II: RFS25V470MG3#5 (low stock at Mouser; 35V alternate: RFS35V470MH3#5)
Nichicon KZ: UKZ1E470MPM
Nichicon FG: UFG1J470MPM (only 63V; other is 10V...)
Nichicon KW: UKW1E470MDD

(2) 47µF/50V
Elna Silmic II: RFS50V470MH4#5
Nichicon KZ: UKZ1H470MPM
Nichicon FG: UFG1J470MPM (only 63V; other is 10V...)

(2) 220µF/6.3V
Elna Silmic II: RFS16V221MH5#5 (16V rating recommended)
Nichicon KZ: UKZ1E221MHM (only at 25Vmin)
Nichicon FG: UFG1C221MPM (only at 16Vmin)
Nichicon KA: UKA0J221MED1TD

(2) 1500µF/63V upgraded to 3300µF/63V (4700µF/63V is even better)
Nichicon KZ: Not available at 63V
Nichicon FG: Not available at 63V
Nichicon KG: LKG1J332MESCBK

(1) 220µF/75V
Nichicon KZ: UKZ2A221MHM (only at 100Vmin)
Nichicon FG: Not available at 100V
Nichicon FW: UFW2A221MHD (only at 100Vmin)

(4) CDC-8002
KSC2690A: KSC2690AYS
MJE350
BC639

(2) CDC-9002
KSA1220A: KSA1220AYS
MJE340
BC640

(2) XA-495
ZTX795A



EQ Board:
(2) 3.3µF/25V
Elna Silmic II: RFS100V3R3MG3#5 (only available at 100V at Mouser)
Nichicon KZ: Not available
Nichicon FG: UFG1H3R3MDM (50V)

(2) 100µF/6.3V
Elna Silmic II: RFS16V101MH3#5 (16V recommended)
Nichicon KZ: Not available
Nichicon FG: UFG1A101MEM (10V)

(2) 1µF/50V
Elna Silmic II: RFS50V010ME3#5 (D=5.0mm / P=2.0mm / I=14mA)
Elna Silmic II: RFS50V010MF3#5 (D=6.3mm / P=2.5mm / I=18mA)
Nichicon KZ: Not available
Nichicon FG: UFG1H010MDM



Tone Control Board:
(2) 47µF/6.3V
Elna Silmic II: RFS16V470MG3#5 (16V recommended)
Nichicon KZ: UKZ1E470MPM (only at 25Vmin)
Nichicon FG: UFG1A470MDM (10V)

(2) 10µF/25V (Non Polar)
Nichicon ES: UES1E100MDM

(2) 1µF/50V
Nichicon VP: UVP1H010MDD

(2) 47µF/10V
Elna Silmic II: RFS16V470MG3#5 (16V recommended)
Nichicon KZ: UKZ1E470MPM (only at 25Vmin)
Nichicon FG: UFG1A470MDM

(2) 10µF/25V
Elna Silmic II: RFS25V100ME3#5
Nichicon KZ: UKZ2A100MPM (100Vmin)
Nichicon FG: UFG1H100MDM (50Vmin)
Nichicon SW: USW1E100MDD[/QUOTE]